Secret Sharer by Alan Catlin

 She was

 a secret

 sharer

 of intimate

 joys

 Was the

 mistress

 to one

 man and

 the wife

 of another

 Loved that

 sick feeling

 that one

 man's ceiling

 is another

 man's floor

Alan Catlin spent 34 years in the trenches working bar wars as a barman in nightclubs, restaurants hotels and local neighborhood Irish bars.  He writes a lot too.